Photodiode



FIG. 1 is a front, top and right side perspective view of a photodiode showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a right side elevational view thereof; the opposite side being a mirror image thereof. 

The ornamental design for photodiode, as shown and described. 